find_the_next_perfect_square.js

/*
You might know some pretty large perfect squares. But what about the NEXT one?

Complete the findNextSquare method that finds the next integral perfect square after the one passed as a parameter. Recall that an integral perfect square is an integer n such that sqrt(n) is also an integer.

If the parameter is itself not a perfect square, than -1 should be returned. You may assume the parameter is positive.

Examples:

findNextSquare(121) --> returns 144
findNextSquare(625) --> returns 676
findNextSquare(114) --> returns -1 since 114 is not a perfect
*/
function findNextSquare(sq) {
  var answer = Math.sqrt(sq);
  if (Number.isInteger(answer)===true){
    return Math.pow((answer + 1),2);
} else {
  return -1;
  }
}